DotNW is likely coming - but considering Symphonia is going to be coming to Steam at the same time as Zestiria (the preorder thing implies this) they'd be stupid to release DotNW at the same time, as then they'd need to have THREE games ready for release at the same time. (Getting Symphonia ready helps explain the fact that Zestiria's release was already somewhat delayed, too.)

So DotNW is likely coming, but at a later date, and I'd be surprised if it wasn't offered both as a bundle with Symphonia and separately as well.